What Do Other Religions Believe? A Comparative Look at Judaism, Christianity, and Islam

Judaism is rooted in a covenantal relationship between the God of Israel and the Jewish people. The Hebrew scriptures treat belief in other gods not merely as theological error but as a betrayal of that covenant — Jeremiah 22:9 frames national catastrophe as the direct consequence of having "forsaken the covenant of the LORD their God, and worshipped other gods" Jeremiah 22:9. This covenantal framework means Judaism's critique of other religions is less about abstract doctrine and more about loyalty and practice.

Deuteronomy repeatedly warns the Israelites that their hearts might be "deceived" into serving other gods Deuteronomy 11:16, and the wilderness narrative in Deuteronomy 1:32 records God's frustration that the people "did not believe the LORD your God" even after witnessing miracles Deuteronomy 1:32. Classical rabbinic tradition, developed by sages like Maimonides (12th century), acknowledged that righteous gentiles could have a share in the world to come through adherence to the seven Noahide laws — meaning Judaism doesn't categorically condemn all non-Jews, but it does insist on the uniqueness of Israel's God.

Modern Jewish denominations disagree on how to regard other faiths. Orthodox Judaism tends toward exclusivity regarding Torah observance, while Reform and Conservative movements, shaped by 19th- and 20th-century liberal theology, often embrace a more pluralistic stance. Nonetheless, the scriptural baseline remains a firm rejection of polytheism and idolatry Jeremiah 22:9.

Christianity inherited Judaism's monotheism but added the claim that Jesus of Nazareth is the definitive revelation of God — a claim that immediately created divisions even among those who encountered Jesus directly. John 9:16 records that some Pharisees declared Jesus couldn't be from God because he broke the Sabbath, while others asked how a sinner could perform such miracles: "there was a division among them" John 9:16. That internal fracture over who Jesus was has, in many ways, defined Christianity's relationship with other religions ever since.

The New Testament is candid that not everyone who heard Jesus believed him. John 6:64 notes that Jesus himself "knew from the beginning who they were that believed not" John 6:64, and Acts 28:24 records that when Paul preached, "some believed the things which were spoken, and some believed not" Acts 28:24. This pattern of mixed reception shaped early Christian theology toward the idea that faith is a gift, not a universal default — a conviction later systematized by Augustine (5th century) and John Calvin (16th century).

Mainstream Christianity has historically held that salvation comes through Christ alone (the doctrine of solus Christus), which implies that other religions, however sincere, are insufficient paths to God. However, Vatican II (1965) introduced a more nuanced Catholic position acknowledging "rays of truth" in other religions, and many Protestant theologians today debate inclusivist versus exclusivist models. The scriptural tension between God's universal love and the particularity of Christ remains unresolved across denominations.

Islam presents itself as the final, complete, and uncorrupted revelation of the one God (Allah), superseding earlier scriptures. The Quran is described as an Arabic recitation "without any crookedness" (ghayra dhī ʿiwaj) so that people may be God-conscious Quran 39:28, implying that previous scriptures, while originally true, have been distorted over time. This framing positions Islam not as one religion among many equals, but as the restoration of the original monotheism preached by all prophets.

Quran 3:85 states unambiguously that whoever seeks a religion other than Islam, it will never be accepted from them, and in the Hereafter they will be among the losers Quran 3:85. Classical scholars like Ibn Kathir (14th century) interpreted this as applying after the advent of Muhammad — meaning earlier followers of Moses or Jesus who lived before Islam are judged differently. Still, the verse sets a stark exclusivist tone that distinguishes Islam from more pluralistic religious frameworks.

The Quran also affirms that earlier prophets — including Hud, who called his people to worship Allah alone Quran 7:65 — preached the same essential message. This means Islam doesn't view Judaism and Christianity as entirely alien; rather, it sees them as earlier, now-superseded stages of the same divine project. Interfaith dialogue in the Muslim world, championed by scholars like Seyyed Hossein Nasr in the 20th century, often draws on this shared prophetic lineage while maintaining Islam's claim to finality.